Objects will be available by accessing the public URL directly. Example:
http://bucket-name.s3.amazonaws.com/uploads/439fbca8-b79b-40e9-8172-4d318737ee14_file.jpg

However, if you wish to customize the URL, you can use a CNAME. First, create/rename your bucket to match the
subdomain (uploads.domain.com). Then create the CNAME (via your DNS settings) using the exact name of the
bucket/subdomain.

To be clear, the bucket's name and CNAME should be identical. i.e. uploads.domain.com

You can now access your files as:
http://uploads.domain.com/uploads/439fbca8-b79b-40e9-8172-4d318737ee14_file.jpg